Superheater



(No Model.)

J. P. SNEDDON. SUPEBHYEATER.

(Application filed Sept. 11. 1901.)

Patented Dec. l6, I902.

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N0. 7l6,297. Patented Dec. l6, I902.

J. P. SNEDDON.

.SUPERHEATER.

- I (Applicakion filed Sept. 11, 1901.) (No Model.) 3 Sheets-Sheet 3.

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steam-boilers; and its object isto provide a JAMES P. SNEDDON,'OFBARBERTON, OHIO, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE STIRLINGCOMPANY, OF JERSEY CITY, NEW JERSEY, A

CORPORATION OF NEW JERSEY.

SUPERHEATERY SPECIFICATION forming part of Letters Patent No. 716,297,dated December 16, 1902.

Application filed September 11, 1901.

To all whom it may concern:

Be it knownthat 1, JAMES P. SNEDDON, a resident of Barberton, in thecounty of Sum mit and State-of Ohio, have invented a new and usefulImprovement in superheaters; and I do herebydeclare the followingto be afull, clear, and exact description thereof.

My invention relates to superheaters for superheater which can beapplied to any water-tubeboiler, whichoccupies a minimum of space, whichis accessiblev at all times and easy of inspection andrepair, and whichpossesses ahigh degree of efficiency. i

To this end it comprises, generally stated, a steam chamber or header,which is placed outside the furnace-walls or in other positions so :thatit is easily accessible, and independently-removable superheating-tubesconnected to said header and projecting into the furnace-chamber, saidheader and tubes being constructed on the principle of the well knownNiclausse boiler-that is, the steam chamber or header is divided by adiaphragm or partition into two compartments, the superheating-tubescomprising outer tubes communicating with one of said compartments andcirculating-tubes projecting into said outer tubes and comm unicatin'gwith the other compartment.

In the accompanying drawings I have shown my invention applied to aboiler of the wellknown Stirling type, and in said drawings Figure 1 isa transverse section through the boiler, showing my superheater appliedthereto. Fig. 2 is a longitudinal section of the same. Fig. 3 is a faceview of the superheater; Fig. 4, a side View thereof, mostly in section;and Fig. 5, a detail sectional view of the skeleton frames forconnecting the tubes to the steam-chamber.

The boilerillustrated, as above stated, is of the well-known Stirlingtype, and the same comprises the upper steam and water drums 1, 2, and3, .the lower mud-drum 4, and the I three series of tubes 5, 6, and 7,connecting the mud-drum with the steam and water drums 1, 2-,;and3,respectively. The feedwater inlet is connected to the drum 1, and thesteam-outlet 8 may be connected to the NlTED STATES pipes 10. Theseveral drums, tubes, and

through the series of tubes 7 to the drum 3,

ing-chamber and projecting into the same, to-

Serial No. 75,094. (No model.)

middle drum 2. The steam and water drums are connected by thesteam-collecting pipes 9 and the drums 2 and 3 by the circulatingpipesare inclosed by the usual masonry walls 11, forming a heating-chamber12. At the front and near the bottom is the grate 13, and above the sameis the ignition-arch 14. Just back of the series of tubes 7 is thebaffle wall or plate 15, and back of the series of tubes 6 is the baffleplate or wall 16. The outlet to the chimney is at 17. The constructionso far described is the: common type of Stirling boiler, and as the sameforms no part of my invention a further detailed description thereof isunnecessary. Suffice it to say that the feed-water entering the drum 1passes through the tubes 5 down into the mud-drum 4, and from thence,inasmuch as the greatest heat is at the front of the furnace chamber, itpasses upward the steam passing over to the drum 2 by the pipes 9 andthe water to the same drum through the pipes 10, and thence said waterdescends through the tubes 6 to the muddrum, thereby establishing thewell-known circulation of the Stirling boiler.

The superheater is shown at 20, audio the specific boiler illustratedtwo such superheaters are shown, one on each side of the heatward themiddle thereof, although it will be understood that either one or morethan two such superheaters may be employed, as necessary or convenient.These superheaters are shown located between the baffle-wall 15 betweenis the most convenient space in the particular boiler shown and the heatat this point is also very high. It will be understood, however, thatthe superheater may be located at any other point in the furnacechamber,if desired or found necessary, and the position thereof will be variedaccording to the type or design or location of the particular water-tubeboiler to whichit is adapted. The superheater comprises the chamber orheader 21, which is provided with a longitudinal diaphragm 22, therebydividing said header into two compartments or passages 23 and 24,respectively. One of these compartments-as,f.orinstance,the compartment23- is connected by a suitable pipe 25 to the steam-collecting pipe 8,while the other compartmentas, for instance, the compartment 24isconnected by the pipe 26 to the engine. In the particular superheaterillustrated the steam-inlet to the compartment 23 is shown at the upperend thereof, while the steamoutlet from the compartment 24 is shown atthe lower end-"thereof. My invention, however, is not limited to thisarrangement, as the inlet and outlet may both be arranged at the sameend of the header or be the reverse of that shown. The steam-inlet tothe header for economical purposes will preferably be connected to theend of the header nearest the steam-collecting chamber of the boiler,while the outlet from the header will be connected to that portion ofthe header which can most conveniently be connected to the engine. Theinlet-pipe 25 is provided with a cut-off valve 27, and the outlet-pipeis provided with a similar valve 28. By means of these valves thesuperheater can at any time be cut out. A by-pass pipe 29, havingacutout valve 30, is provided around the superheater, so that in case thesuperheater becomes disabled steam can be taken from thesteam-collecting chamber of the boiler directly to the engine.

The front and rear walls and the diaphragm or partition of the headerare provided with alining openings 31, 32, and 33, respectively, inwhich openings are fitted the skeleton frames or lanterns, as they arecalled, 34.

To the rear ends of the skeleton frames are attached the forward ends ofthe outer tubes 36, said tubes having closed rear or outer ends. Withinthe skeleton frames or Ianterns 34 are other skeleton frames 37, whichextend from the front wall of the header to the diaphragm 22 and whichhave connected to their rear ends the inner circulating-tubes 38, thesetubes extending back into the tubes 36 and having their rear open endsin proximity to the closed ends of the outer tubes. The skeleton frames34 and 37 are cut away, so that free communication is bad between thecompartment 23 and the inner tubes 38 and the compartment 24 and theouter tubes 36, and said frames are held in place by means of the yokes39 and bolts 40.

The construction of this superheater with a header having twocompartments, the inner and outer tubes, the skeleton frames, and thejoint between said frames and the header is substantially the same asthat of the wellknown Niclausse boiler, and further detailed descriptionthereof is unnecessary. Suffice it to say that the steam entering saidsuperheater-header passes from the compartment 23 through the skeletonframes 34 and 37 into the inner circulating-tubes 38 and through thelatter to the rear ends of the outer tubes 36, and thence passes forwardthrough the the tubes projecting into said chamber. This is deemed thepreferable construction, as the superheater can be readily removed inorder to repair the same and the tubes thereof are exposed on theoutside, so that they can be removed and replacedatpleasure and evenwhile the flame and gases are passing through the superheater-tubes.This arrangement also protects the header from the heat and insures atight connection between the tubes and the header at all times. Thisarrangement, however, is not essential, as the header may be locatedentirely outside the furnace-walls or inside the same and need notnecessarily be at the sides of the boiler, but can be eitherin front, atthe rear, or top thereof. Neither need it be in the inclined positionshown, this being merely chosen for illustration, as with the particulararrangement of boiler Watertubes illustrated this is preferable.

It will be observed that the superheater occupies a minimum amount ofspace, is so constructed that it can be easily removed from theboiler-furnace, if necessary, and so that the tubes can be removed andreplaced individually for purposes of repair, and at the same time itofiers a large heating-surface, thereby rendering it very eflicient.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a superheater for steam-boilers, the combination with aheating-chamber, of Water-tubes therein, a header located outside of 1said chamber and having two compartments,

tubes removably connected thereto and projecting into the chamberbetween the watertubes, said tubes comprising outer tubes communicatingwith one of the header-compartments and inner tubes communicating withthe other header-compartment, said header having in its outer wallopenings opposite said tubes of sufficient size to permit the removaland insertion of said tubes, connections between the steam-collectingspace of the boiler and one of the header-compartments, and steam-outletconnections from the other header-compartment.

2. In a superheater for steam-boilers, the combination with aheating-chamber, of a water-tube boiler therein, a header locatedoutside of said chamber and provided with a longitudinal diaphragmforming two compartments therein, aliniug openings in said diaphragm andthe header-walls, skeleton frames removably secured in said openings andcommunicating with both of said compartments, outer tubes connectedtothe inner ends of said frames and projecting into the heating-chamberand having closed rear ends, open ended tubes within said outer tubesand having their forward ends connected to the skeleton frames at thediaphragm,

connections between the steam -,collecting space of the boiler and oneof the header-compartments, and steam outlet connections from the otherheader-compartment.

3. In a superheater for steam-boilers, the combination with aheatingbhamber, oftwo elevated steam and water drums and a lowermud-drum therein, a cluster of water-tubes connecting thefront steamandwater drum with the mud-drum, a cluster of Water-tubes connecting therear steam and water drum with the m ud-drnm,a cluster of superheatingamud-drum, a cluster of tubes connecting the front steamand water drumwith the muddrum, a cluster of tubes connecting the rear steam and waterdrum with the mud-drum, a header having two compartments located outsideof the heatingchamber, superheatertubes connected thereto and projectinginto the heating-chamber between the said clusters of tubes, saidsuperheater-tubes being independently removable and comprising outertubes communicating with one of the header-compartments and inner tubescommunicating with the other of the header-compartments, steam-inletconnections to one of said compartments, and steam-outlet connectionsfrom the other of said compartments.

5'. In a steam-boiler, the combination with a heating-chamber, of aheader located outside of said chamber, independently-removablesuperheating-tubes connected to said header and projecting into saidchamber, connections between the steam-collecting chamber of the boilerand said header, asteamoutlet from said header, a by-pass pipe aroundsaid header, and cut-ofi valves in said connections and by-pass pipe.

In testimony whereof I, the said JAMES P. SNEDDON, have hereunto set myhand.

JAMES P. SNEDDON. Witnesses:

E. E. BAKER, J, CLARENCE FRANK.

